Sulfur dye.



of the German .l l 'teld. Germany, have invented new and useen iren erraerae OF ELBERFELD, GERMANY, ASSKGNOR TO &' (10., F ELBERFELD, GERMANY, A COBPQBATION 0F JOSEPH FLACHSLAENDER,

VORIVI. FRIEDB. BAYER GERMANY.

re reat" @EEFliiQiE.

FABBENFABRIKEN SULFUR DYE.

No Drawing.

Specification of Letters Patent. Patgntrgd S g-pt, 28, ,QQQQ, Application filed July 1, 1909. Serial No. 505. 101.

To all whom it may concern:

Be it known that I, JOSEPH FLACHSLAEN- pica, doctor of philosophy, chemist, citizen mpire, residing at Elbernew Sulfur Dye, of a speclfication.

and valuable t'ul Improvements in which. the following 18 l have found that a new black sulfur (lye can be obtained by treating black shade.

dinitrochlorophenol having the formula:

and subsequently precipitating the dye b] means of acids, air or the like. tinguished by its beautiful blooniy deep It is obtained with a very good yield.

Example: 218 parts of dinitrochlorophenol (()ll 1N0 :N(). :(Jl l :2 r :6) into an alkaline polysuliid solution prepared from (328 parts of crystallized sodium eulfid and 138 parts of sulfur which alkaline poly- The new coloring matter is (lis- 1 are introduced sulfid solution heated to C. The whole is thereupon heated to H5 C. for about 16 hours. The dyestuti precipitated with air. it is after being dried and pulverized a black powder which is insoluble in water and in concentrated sulfuric acid (66 It is easily soluble in solutions of sodium sulfid with a blaislrgreen color, and dyes unmordanted mtton black shades from a bath containing; sodium sulfid and salt. Be.) with a blue color.

'I claim:

The herein before described new sulfur dye obtainable from dinitrochlorophenol ((l llIN(). ,ZNO ZCl 1 21413). which is after being drietl and pulverized a black powder insoluble in water and in concentrated sulfuric acid, soluble in caustic soda lye (30 Be.) with a blue color; easily soluble in solutions of sodium sullid with a bluislrgreen color and dyeing unnioi'danted cotton'blzu-k shades, substantially as described.

in testimony whereol l have hereunto set my hand in the presence of two subscribing witnesses.

It is oluble in caustic soda lye (30- 

